Debt (Revolving Credit Facilities) (Narrative) (Details)	12 Months Ended
	Aug. 29, 2020 USD ($) agreement	Aug. 31, 2019 USD ($) agreement	Sep. 01, 2018 USD ($)
Debt Instrument [Line Items]
Weighted average rate under Credit Facility	1.42%	3.01%
Borrowings under Credit facilities	$ 1,012,200,000	$ 382,000,000	$ 242,000,000
Repayments of debt	916,000,000	451,000,000	$ 350,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Outstanding balance	250,000,000
Committed Bank Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 600,000,000
Maturity date	Apr. 14, 2022
Credit facility, expiration term	5 years
Available increase in amount borrowed	$ 300,000,000
Outstanding balance	100,000,000
Letter of Credit [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	50,000,000
Outstanding balance	$ 16,742,000	$ 3,087,000
Uncommitted Bank Facilities [Member]
Debt Instrument [Line Items]
Number of credit facilities | agreement	5	6
Credit facility, maximum borrowing capacity	$ 410,000,000	$ 440,000,000
Outstanding balance	1,200,000	$ 155,000,000
Amended Uncommitted Facilities [Member]
Debt Instrument [Line Items]
Outstanding balance	0
New Uncommitted Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	5,000,000
Outstanding balance	$ 1,200,000